A Submicrowatt 1.1-MHz CMOS Relaxation Oscillator With Temperature Compensation

A 1.1-MHz submicrowatt current-mode relaxation oscillator with temperature compensation is presented. In this oscillator, the current-starving inverters are biased by using the current sources with positive and negative temperature coefficients. It relaxes the temperature variations. This oscillator...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2013-12, Vol.60 (12), p.837-841
Main Authors: Chiang, Yu-Hsuan, Liu, Shen-Iuan
Format: Article
Language:English
Subjects:
CMOS
Delays
Electric potential
Energy management
Frequency variation
Inverters
Low power
Low power electronics
Mathematical analysis
Oscillators
relaxation oscillator
Relaxation oscillators
Resistors
subthreshold
temperature coefficient
Temperature compensation
Temperature measurement
Transistors
Voltage
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Summary:A 1.1-MHz submicrowatt current-mode relaxation oscillator with temperature compensation is presented. In this oscillator, the current-starving inverters are biased by using the current sources with positive and negative temperature coefficients. It relaxes the temperature variations. This oscillator is fabricated in a 0.18- μm CMOS process, and its area is 0.075 mm 2 . The power consumption is 0.859 μW, with a supply voltage of 1.8 V, and the calculated figure of merit is 0.78 nW/kHz. The measured output relative frequency variation is less than 3%/V for the supply voltage of 1.2-2.4 V and ±0.5% for the temperature of -20°C-80°C. The average temperature coefficient is 64.3 ppm/°C.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2013.2281920